The pigment leghaemoglobin is present in the roots of

The anaerobic condition for nitrogen fixation is maintained by ..........

The amount of nitrogen in nature is fixed by .....

Trace the events starting from the coming in contact of Rhizobium to a leguminous root till nodule formation. Add a note on the importance of leghemoglobin.

The bacteria found in the root nodules of the family $Leguminosae$ are:

Leghaemoglobin occurs in